/*
 * Copyright 2011 Ian D. Bollinger
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.cleansvg;

import java.io.*;
import com.google.common.base.*;
import com.google.common.io.*;
import com.google.inject.*;

class OutputProvider implements Provider<OutputSupplier<? extends Writer>> {
    private final Optional<File> file;

    @Inject
    OutputProvider(final Optional<File> file) {
        this.file = file;
    }

    @Override
    public OutputSupplier<? extends Writer> get() {
        return file.isPresent()
                ? Files.newWriterSupplier(file.get(), Charsets.UTF_8)
                : new StandardOutputSupplier();
    }

    private static class StandardOutputSupplier implements
            OutputSupplier<OutputStreamWriter> {
        @Override
        public OutputStreamWriter getOutput() {
            return new OutputStreamWriter(System.out);
        }
    }
}
